The Systematic Computer-Aided Design(SCAD)method is presented by combining the Systematic Engineering Design method with CAD technology in this paper. Particular implementing scheme of the four phases included in SCAD,Computer-Aided Product Planning(CAPRP),Computer-Aided Conceptual Design (CACD),Computer-Aided Embodiment Design(CAED)and Computer-Aided Detail Design(CADD),are studied.So the basic theoretical framework of SCAD technology is built.